I have both specifically for this reason.
Plex is for my family who only need to know ‘login to your Plex account’, but I personally use Jellyfin because I’m on my VPN. I got the lifetime pass for under $100 ($80?) and it has saved me a lot of time by preventing technical issues that would need my personal attention.






Putting yourself into the position of trying to solve a practical problem is the best way to learn.
If you fail completely, you can always restore your system and try again (you have a backup, right?)